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- > Do-It-Yourself Appliance Repair Help > The Kitchen Appliance Repair Forum > Whirlpool Microwave model MH1170XS not heating

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Whirlpool Microwave model MH1170XS not heating  Rate Topic 
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 Posted: Tue Sep 28th, 2010 08:27 pm
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arvis
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I have a Whirlpool Microwave model MH1170XS that is not heating.  It sounds normal as far as I can tell.  I replaced the high voltage diode and it worked fine for about two weeks but then it stopped heating again.  I thought initially it was the magnetron but when testing resistance it was 1.4 at first but I tested again and it was 0.9.  I need to pull it off the wall and tested it again. 

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 Posted: Tue Sep 28th, 2010 08:51 pm
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MH1170XSxx

are there (2) more characters at the end of your model number ?

is the Diode bad again ?



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 Posted: Tue Sep 28th, 2010 09:21 pm
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arvis
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Sorry left off the the last two characters.  Full model is MH1170XSS1.  Thanks

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 Posted: Tue Sep 28th, 2010 09:45 pm
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Yes you need to pull it down to do some testing. Start by checking the doide again. If that looks good, run the microwave and see if your getting 120 V to the primary side of the HV transformer (2 small wires coming from the control board).



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 Posted: Wed Sep 29th, 2010 06:21 am
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arvis
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The diode looks okay and there was no smell when the microwave stopped heating.  I need to get a new multimeter to test the diode my old one seems to be giving me funny numbers.  I tested the voltage to the high voltage transformer and it was 120v.    

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 Posted: Wed Sep 29th, 2010 12:04 pm
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one way to test them using a 9v Battery ..

High Voltage Diode Testing



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 Posted: Wed Sep 29th, 2010 04:45 pm
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Testing the diode with the 9 volt battery I had 0.00 to 0.01 reading on the first test.  The second test gave me -5.00- -5.05 reading. 

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 Posted: Wed Sep 29th, 2010 04:50 pm
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looks good ...

as long as the readings are very different ..

 



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 Posted: Wed Sep 29th, 2010 09:53 pm
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Next you need to ohm the capacitor.

If you feel comfortable with electricity you can check the transformer and capacitor at the same time by disconnecting the wires to the magnatron and running the unit for a minute, disconnect the power and take a screw driver and short across the terminals of the capacitor....if you get a little pop and spark you have a bad magnatron....no pop or spark then you have to test the transformer and capacitor individually.



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 Posted: Thu Sep 30th, 2010 08:20 am
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I did as you said and disconnected the magnetron.  After powering up the microwave for  1 minute i got a spark and pop when shorting across the capacitor terminals.

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 Posted: Thu Sep 30th, 2010 08:55 am
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Capacitor would seem to be good ..

MH1170XSS1 Tech Sheets



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 Posted: Thu Sep 30th, 2010 12:56 pm
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arvis wrote: I did as you said and disconnected the magnetron.  After powering up the microwave for  1 minute i got a spark and pop when shorting across the capacitor terminals.
That would be pointing to a bad mag tube.



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 Posted: Tue Nov 16th, 2010 07:39 am
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Sorry i did not get back sooner.  I had computer issues.  I replaced the magnetron on 10/3/10.  The microwave worked great until yesterday 11/16/10.  Now the microwave has no heat at all.  I opened the microwave again and the only thing I can visually see is a little blackened area on the solid red wire attached to the magnetron from the capacitor.  About a week earlier when my wife was using the microwave I thought I smelled something electrical burning.  She could not smell it so I don't know if it is related to this latest failure.  Visually the diode looks ok.  I was also wondering  since i replace the diode about 1 week before replacing magnetron if that would cause premature failure?  The microwave worked for a short time after replacing the diode before I had to replace the magnetron.  I still need to pull everything apart and test it.

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 Posted: Tue Nov 16th, 2010 08:59 am
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arvis
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I disconnected the two wires from the magnetron to inspect them.  I hooked them back up and put a bowl of water in the microwave to fire it up to test the capacitor.  After starting it up for 1 minute i noticed the water getting hot.  So now I don't know what the problem is with this microwave.  Does anybody have any suggestions before I put it back together and hang it on the wall.  Thanks

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 Posted: Tue Nov 16th, 2010 01:57 pm
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Sounds like you have a bad connection. The wires going to the capacitor have to be tight. Check all the connections, tighten them all up.



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 Posted: Tue Nov 16th, 2010 03:33 pm
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i dont know how old your Whirlpool  microwave is but ive had 2 in the past month that has had a loose wire on the magatron and they both were under 2 years old same model # not sure if its the same as yours like appl tech said tighten all connections and should be fine

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